What are the drawbacks of preamp output transformers? Say a typical 5k:600 OPT feeding an amp with a 10k impedance. Now the reflected impedance on the preamp tube is 80k. How does this work out? would seem such a shallow loadline as to be no power left? With the 5842 spud amp I have with the 10k input impedance an OTL analog stage of the DAC I'm building is a bit outof the question, so I am looking for opinions on the use of line level output transformers.